4oz per person, so that would be 15lbs. As usual I advise a little more to cope with spills or big appetites. A generous estimate would be 3 extra lbs. You must be having quite a party; can I come too? LOL

A single serving of corn is estimated at 2.5 ozs. And is sold in one pound bags in the supermarket. That is a good serving spoon size. It all depends on what you are serving along with this. If serving a salad or another fresh or frozen vegetable then this size serving would be sufficient.

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You will get 2.5 servings out of each pound and you will only need 8 pounds of frozen corn. You have to realize what you get portion wise when you eat in a restaurant. You never get homestyle portions. And same goes for entertaining large groups or crowds of people. I hope I was helpful. Good luck on your gathering. I hope we hear from you about your gathering.